What he showed you is a piggyback fuel controller. It takes over control of the inectors. You use a laptop to program it. The stock RXP ecu stays there and continues controlling everything EXCEPT the fuel.

What he showed you is a piggyback fuel controller. It takes over control of the inectors. You use a laptop to program it. The stock RXP ecu stays there and continues controlling everything EXCEPT the fuel.

what about the gtx ltd....... i have an 05 gtx ltd?

i still dont see what the problem will be id i disconect the fuel injectors from the ecu and control the fuel delivery with another setup?

why do i need a piggyback? i can piggy back off of the current sensors etc that are there for my fuel delivery setup?

2) You NEED a piggy back fuel control unit to take the fuel controlling capabilities away from the ECU. The piggy back offers the ability to load up different fuel maps whereas the ECU is not programmable.

3) You must be extremely heavily modified before even considering using a piggy back fuel controller and larger injectors as the stock injectors deliver PLENTY enough fuel.

I quickly learned this in my application and have since removed the piggy back and larger injectors.

If you are looking for added performance look for it elsewhere. Adding bigger injectors and a fuel controller is going to do nothing for your GTX.